I have a Humitter 5ou humidity sensor that has a voltage input requirement of between 7 and 30 volts and outputs 0 to 1 volt on the third wire variable on humidity, not sure on how to use it with arduino, can I connect sensors positive lead to a >7v positive supply then the sensors ground to the negative of >7v supply, obviously the 0-1 volt will go to an analogue pin, but is it safe (for the arduino analogue pin) to complete the circuit by connecting arduino ground to >7v ground.
Arduino analogue ----- Sensor------- +7 to 30v
|
|
Arduino ground ----------------------- -7 to 30v